# Bug description In `ivas_mdct_core_tns_ns_fx()` the subframe lengths are calculated using `BASOP_Util_Divide3216_Scale()`, especially given that `nSubframes[ch]` is either 1 or 2. ``` L_frame_global[ch] = BASOP_Util_Divide3216_Scale( st->L_frame, nSubframes[ch], &exp ); move16(); L_frame_global[ch] = shl( L_frame_global[ch], add( exp, 1 ) ); move16(); L_frameTCX_glob[ch] = BASOP_Util_Divide3216_Scale( st->hTcxDec->L_frameTCX, nSubframes[ch], &exp ); move16(); L_frameTCX_glob[ch] = shl( L_frameTCX_glob[ch], add( exp, 1 ) ); move16(); L_spec[ch] = BASOP_Util_Divide3216_Scale( st->hTcxCfg->tcx_coded_lines, nSubframes[ch], &exp ); move16(); L_spec[ch] = shl( L_spec[ch], add( exp, 1 ) ); move16(); ```